Certificate of correction



March 8, 1932. M. s. HART ET AL METAL PANEL Filed Nov. 27.. 1928 HarwellSfiart,

G. Hz'ldzzzg A 11 derson, Gerald A. McDonald, INVENTORS.

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ATTORNEY Patented M ar. 8, 1932 UNITED STA ES PATENT OFFICE MAXWELL S.HART, GUSTAV HILDING ANDERSON, AND GERALD A. MACDONALD, OF NEW BRITAIN,CONNECTICUT, ASSIGNORS TO THE HART-Q; HUTCHINSON COMPANY, OF NEWBRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT mm ram Applicationfiled November 27, 1928. Serial No. 822,214.

This invention relates to metal panel construction, and moreparticularly to a metal panel comprising a pair-of opposed telescopingparts adapted to be permanently locked together by the operation offorcing said parts together in a press without the use of bolts, rivets,or welding.

One object of this invention is to provide .a'panel of the above naturein which the opposite sides thereof are formed from separate sheets ofmetal provided with inwardly extending flanges on their edges, whichflanges are adapted to interlock with each other when the sides of thepanel are telescoped.

A further object is to provide a panel of the above nature which will besimple in construction, of excellent heat-resisting quali ties, whichwill not twist or warp when sub jected to a high temperature, which willbe inexpensive to manufacture, easy to assemble,

ornamental in appearance, and very eflicient and durable in use.

7 With these and other objects in view there have 'been illustrated onthe accompanying drawings two forms in which the invention mav beconveniently embodied in practice.

Fig. 1 represents a view in elevation of a fire door embodying theinvention.

Fig. 2 is a transverse sectional view taken along the line 22 of Fig. 1,looking in the direction of the arrows.

Fig. 3 is a similar sectional view of a modified form of the invention.

Referring now to the drawings in which like reference numerals denotecorresponding parts throughout the several views. the numeral 10indicates a fire door embodying the inve ntion. said fire doorcomprising a panel formed from a pair of rectangular metal sheets 11 and12 having flanges 13 and 14 upstanding from the edge thereof. The twoflanges 13 and 14 are adapted to be brought into telescoping relationsurrounding a filler or core 15. the latter being constructed of anysuitable heat-insulating and sound-deadening material such as wood,paper, corrugated cardboard, cork, etc.

The filler or core 15 should preferably be made slightly thicker thanthe normal inside depth of the assembled panel. Thus,

upon assembly-in the press, the filler will be compressed slightly, andwhen the pressure is relieved, the natural resiliency of the filler willexert an expansive pressure or force upon the sheets 1 and 2, thuscausing the interlocking sections of the flanges 13 and 14 to be moretightly locked together.

The flanges 13 and 14 are provided on their edges with means forproducing an interlocking joint between the sides of the panel when thelatter are forced together in the press. For this purpose, the flange 13has an inclined section 16 extending inwardly and terminating in anoutwardly-inclined section 17, whereby a V-sha ed groove is formed, asclearly shown in ig. 2. The inclined section 17 is connected at itsouter edge with an inclined inwardly-extending cam section 18 adapted tocooperate with a similarly inclined wedge section .19'bent backwardlyand inpardly from the flange 14 of the metal sheet In operation, whenthe two cooperating telescoping sides 11 and 12 of the. panel are forcedtogether in a press, the wedge section 19 of the flange 14 will firstengage the cam section 18 of the flange 13. This will cause the flange13 to be bent inwardly and the flange 14 to yield outwardly until thewedge section 19 passes beyond the outer edge of the cam section 18,whereupon the wedge section 19 will snap suddenly automatically into theV-shaped groove formed by the inclined sections 16 and 17, securely andpermanent- 1y locking the two sides 11 and 12 of the panel together. Theangle of the inclined section 17 is so pitched that it will bepractically impossible thereafter for the wedge member 19 to be forcedout of position.

The dimensions of the parts will preferably be so designed that when thesides 11 and 12 are assembled, the wedge section 19 will lie in flatcontact with the inclined section 16, and the flanges 1 3 and 14 willlie flush and in alinement with each other. The small groove at thejoint between said flanges 13 and 14 will preferably though notnecessarily be filled. with any suitable sealing malike as shown in Fig.2.

While in the embodiment shown in Fig. 2 the lower edge of the camsection 18 does not touch the sheet 12, it is within the spirit andscope of the invention to so construct said cam section, in which casethe cam section 18 would be pressed upwardly for holding the wedgesection 19 more firmly in position, such construction not beingshown.

In the modified form of the invention shown in Fig. 3, the cooperatingside members of the panel comprise metal sheets 19 and 20 havinginwardly extending upstanding flanges 21 and 22, similar to the flanges13 and 14 of the first form of the invention. Instead of employing aV-shaped groove, as in the flange 13, the flange 21 is bent inwardly at23, downwardly at 24:, and outward at 25 to form a rectangular groove,no section similar to the cam section 18 being employed. The flange 22is provided with a short inclined wedge section 26 having its extremitybent outwardly at 27 to lie parallel in flat contact with the section25.

The present invention will be found es pecially adapted for use for theconstruction of fire doors, fire resistant walls and the like, but isnot limited to these uses.

While there have been disclosed in this specification two forms in whichthe invention may be embodied, it is to be understood that these formsare shown for the purpose of illustration only, and that the inventionis not to be limited to the specific disclosures but may be modified andembodied in various other forms without departing from its spirit. Inshort, the invention includes all the modifications and embodimentscoming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, andfor which it is desired to secure Letters Patent, is:

1. In apanel construction a pair of opposed side members arranged indifferent planes, each of said side members having a resilient flangeupstanding along the edge thereof, said flanges being alined and shapedto telescope with each other and having interlocking means whichautomatically become effective when said side members are forcedtogether in a press.

2. In a panel construction, a pair of opposed side members. each of saidside members having a resilient flange upstanding along the edgethereof, said flanges being shaped to telescope with each other andhaving interlocking means which automatically become effective when saidside members are forced together in a press, and a filler core normallythicker than the final inside dis tance between said side members sothat said core Wlll exert resilient pressure to assist in maintainingsaid flanges permanently interlocked.

3. In a panel construction, a pair of opposed side members, each of saidside members havin a flange upstanding along the edge thereof, saidflanges being automatically shaped to telescope with each other andhaving interlocking means which become effective when said side membersare forced together in a press, one of said flanges having a groove, andthe other of said flanges having a wedge member adapted to fit into saidgroove when the side members are interlocked.

4. In a panel construction, a pair of opposed side members, each of saidside members having a flange upstanding along the edge thereof, saidflanges being automatically shaped to telescope with each other andhaving interlocking means which become effective when said side membersare forced together in a press, one of said flanges having a V-shapedgrove, and the other of said flanges having a wedge member adapted tofit into said groove when the side members are interlocked.

5. In a panel construction, a pair of opposed side members, each of saidside members having a flange upstanding along the edge thereof, saidflanges being automatical- 1y shaped to telescope with each other andhaving interlocking means which become effective when said side membersare forced together in a press. one of said flanges having a groove, andthe other of said flanges having an inclined wedge member adapted to fitinto said groove when the side members are interlocked.

6. In a panel construction, a pair of opposed side members, each of saidside members having a flange upstanding along the edge thereof, saidflanges being shaped to telescope with each other and havinginterlocking means which become effective when .said side members areforced together in a press, one of said flanges having a groove, and theother of said flanges having an inwardly extending wedge member adaptedto fit into said groove when the side members are interlocked, saidflanges lying flush with each other when the side members have beenassembled.

7. In a panel construction, a pair of opposed side members, each of saidside members having a flange upstanding along the edge thereof. saidflanges being shaped to telescope with each other and havinginterlocking means which become effective when said side members areforced together in a press, one of said flanges having a groove, and theother of said flanges having a wedge member adapted to fit into saidgroove when the side members are interlocked, said grooved flange havingan inclined cam member connected therewith for engagement with saidwedge member to cause said flanges to yield to permit assembly of saidside members, said flanges lying flush with each other when the sidemembers have been assembled.

8. In a panel construction, a air of opposed side members, each of saiside members having a flange upstanding along the edge thereof, saidflanges being shaped to telescope with each other and having inter;-locking means which become effective when said side members are forcedtogether in a press, one of said flanges having a groove, and the otherof said flanges having a wedge member adapted to fit into said groovewhen the side members are interlocked, said grooved flan 6 having aninwardly extendmg cam mem er connected therewith for engagement withsaid wedge member to cause said flanges to yield to permit. assembly ofsaid side members, said flanges lying flush with each other when theside members have been assembled.

9. In a vpanel construction, a pair of opposed side members, each ofsaid side members having a flange upstanding along the edge thereof,said flanges being shaped to telescope with each other and havinginterlocking means which become effective when said side members areforced together in a press, one of said flanges having a groove, and theother of said flanges having a. wedge member adapted to fit into saidgroove when the side members are interlocked, said so grooved flangehaving a cam member connected therewith for en a ement with said wedgememberto cause said flanges to yield to permit assembly of said sidemembers, said flanges lying flush with each other when the side membershave been assembled.

10. In a panelconstruction, a pair of opposed side members, each of saidside members having a flange upstanding along the edge thereof, said,flanges being shaped to telescope with each other and havinginterlocking means which become effective when said side members areforced together in a press, said flanges lying flush with each other andhaving the joint therebetweenfilled with a sealing material.

11. In a panel construction, a pair of 0pposed side members, each ofsaid side members having a flange, upstanding along the edgethereof,'said flanges being shaped to telescope, with each other andhaving interlocking means which become effective when said side membersare forced together in a press, said flanges lying flush with eachother.

.In testimony whereof, we have aflixed our signatures to thisspecification.

MAXWELL S. HART. GUSTAV HILDIN G ANDERSON.

GERALD A. MACDONALD.

QER'MFICATE 0F QORRECTHQN.

Patent m. 1 mm Granted March s, 3932, w

mxmm so mm ET AL.

Hz is hereby mama mm error appears fin the printed specification 9% theabove numbered patent rewiring cmrecton as iomaws: Page 2,, Mine 42,mfiazim A, after "constsrmtien" finsen a cama; same page, lines 67, 79ami $0, 91 and 92, ciaims 3 and 5, respwtivefly, 5m "amtomatcaifiy"reafi aimed and; am? that me said Letters 3921mm shoufil be mad withthese cortemiam 1121mm am the same may minim-m w the reward 0% im casein the Emem mike.

Signad and sealed. this 5m day 0% Aprii, A. D" 1932.

M. 3. Mame (Sea!) Acting Gmmissimm 9i fimmsn

